Im sorry but that's far from the start of the problem. You dont go from being one of the worst players to a decent player just because you put on 15-20 bs.
I've seen skinny players in the NBA play well despite being skinny. Cody's problems start with his mental.
There have also been some guys who couldn't physically compete. One of them was KZ Okpala, who is out of the league. Another one is Ziaire Williams, now in Brooklyn after moving on from Memphis. Another one is Jalen McDaniels, who is buried deep on the bench in Washington.